Silencer.



A. LLOYD-HOBBY.

v SILENCER. I

' APPLIUATION FILED $EPT.18, 19114 1,031,943, Patented July 9, 1912.

2 SHEETSSHEET 1.

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1,031,943; Patented July 9, 1912' mums-sum 2 WITNESSES: l/VVE/VTOR FLF/FED 1L0 yo Ham R5, Tina/2!! yhgy WM UN TE s ATns P T NT OFFICE.

ALFRED LLOYD-HURRY, OF" SAN FRANCISCO, CALIFORNIA, AssIsivoR or ONE-HALF To HORACE oTTo LITTLE, or SAN FRANCISCO, CALIFORNIA.

SILENCER.

Specification of Letters Patent.

Patented July 9, 1912.

Application filed September 18, 1911. Serial No. 649,797. l I

I To all whom it mag concern:

Be it known that I, ALrnnn LLoYo-HoRnY, 'a subject of Great Britain, and aresident of the city'and county of ,San Francisco and State of-California, have invented certain new and useful Improvements in Silencers, of which the following-is a specification.

The invention relates to silencers, or mufflers which are used inconnection with internal combustion enginesto reduce or silence the noise of the exhaust.

The object oft-he invention is to provide a device which will silence the exhaust of an internal combustionengine, without subjecting the engine to the high back pressure produced by the mufliers at present in general use.

Another object ofthe invention is to pro vide a silencer which converts the pulsations of an engine discharge. into a continuous stream.

Another object of the invention is to pro vide a silencerwhich operates of itself to exhaust the gases contained therein when theengine has ceased operating. V

A further object'of the invention is to v provide a silencerarranged to prevent the ignition and explosion of the unburned gases contained therein.

The device possesses o-theradvantageous features, which, with the foregoing will be set forth at length in the following description, where I shall outline in full that form of embodiment of the invention which I have selected for illustration in the draw-.

ings accompanying and forming part of the present specification. The novelty of the invention will be included inthe claims succeeding said description. From this it will,

be apparent that I do not restrict myself to the showing made'by such drawings and descriptions, as I may adopt many-variations within the scope of my invention as expressed" in said claims.

Referring to the drawings :-Figure 1 is a view of the-silencer of'my invention attached to the exhaust pipe. of an internal combustion engine. Fig. 2' is a longitudinal section through a silencer of my invention showing the operating parts thereof.

3 is a cross section taken on the line (ra. of.

Fig. 2. Fig. e is aview showing an expansion chamber interposed between the engine and the silencer. Fig. 5 1s a longitudinal e5. section through a modified form of silencer.

- impervious material int-o the opposite ends of which the inlet pipe 7 and the outlet pipe 8 extend. The bag is clamped to these pipes by the clamping bars 9 so that the exhaust taken on the line a lid orcover so ,that it may be removedtoallow ready access to the interior. Within the casing is arranged a bag fiof a flexible gases are confined to the bag and cannot gain access to the chamber surrounding, the bag. The outlet pipe8 preferably extends into the bag and is provided on its inn erend with a cap 12 provided with a plurality of holes 13. v The object of this arrangement'is to prevent the concussion of the exhaust from the engine from passing directly through the p The bag being flexible" it is readily seen bag. that the volume thereof will vary as the inbag, the casing is made air tight by means of the gasketl lyand a small amount of air is'in jected through the valve 15, so that the pressure within the chamber slightly higherthan atmospheric pressure. As the volume of the bag increases, the volume in .the casing surrounding it decreases, with-a consequent rise in pressure. The bag is thereby prevented from becoming ruptured by sharp shocks'or percussions. The pressure on the outside of the bag also tends to collapse it, so that when the engine is stopped all'the gases therein are. forced out through the outlet pipe. I This'will revent explosions in the Silencer due to a back-fire from the engine. To further preventa back-fire from the engine when thebag inflated,-I have arranged a wire gauze'16 in the inlet pipe. The inlet pipe 7" is provided .ternal pressure varies, thereby actingto absor-b the concussions and cause thegases passfing therefrom to issue in a steady stream. In order to increase the cushion effect of the with a detachable connection,-such asa. union 17, at-the point where the gauze 16 is located, so that the gauze may be readily re -l moved and a new piece inserted when it be-' comes fouled or worn. I prefer to make the bag of Wire reinforced rubber or asbestos material, such as is used for packing, and as this material may be aiiected by the high temperature of the exhaust gases, it may be advisable to pass the gases through an ex pansion chamber 18 to partially cool them, before they enter the silencer. The inlet pipe 19 of the expansion chamber is also preferably provided with a unionconnection 21 in which is arranged a wire gauze, topreventa back-fire or the gauze may be placed in the cooling chamber.

In Figs. 5-6 I have shown a modification in which a diaphragm 22 is used instead of the bag (5. The operation of this device is the same as that shown in the other figures. The diaphragm 22 is attached to a ledge 23 extending around the casing, thereby dividing the chamber into two compartments. The chamber 2% below the diaphragm is provided with the inlet and outlet ipes 7 and 8 and the chamber '25 above t e'dia phragm is air tight and is provided with an air valve 15, for increasing the pressure within said chamber as desirable. As in the first described construction, the volume of chamber 2 1 will vary with the pressure therein and the concussions of the exhaust will be absorbed. In operatiornthe diaphragm or bag pulsates with the entrance of the exhaust gases.

I claim: I

1. An exhaust silencer comprising a chamber having a wall formed of a.fiexible material, clamped in place along its edge portions and having its body portion free to move under varying pressures within the chamber. i

2. An exhaust silencer comprising a chamber having inlet and outlet openings, one side of said chamber being flexible, and an air tight chamber inclosing said flexible side.

An exhaust silencer comprising a flexible receptacle of an impervious material having inlet and outlet openings, and an air tight casing surrounding said receptacle and spaced apart therefrom-transversely.

4. An exhaust silencer comprising a flexible receptacle provided with an inlet opening, an outlet pipe extending intosaid receptacle and being rovided on its end with a plurality of relatively small outlet holes, and an air tight casing surrounding said receptacle.

5. An exhaust silencer comprising'a fiexible receptacle having inlet and outlet openings, an air tight chamber surrounding-said receptacle and adaptedto contain air under pressure and a wire gauze in said inlet.

6. An exhaust silencer comprising a receptacle having movable walls of an impervious material, and provided with inlet and outlet pipes, an'air tight casing sur rounding said receptacle and through which the inlet and outlet pipes pass, and means for admitting air under pressure into said casing.

7. An exhaust silencercomprising a receptacle adapted to change its volume withvariations in internal pressure and a sur rounding air tight casing having a constant volume, said receptacle being provided with inlet and outlet pipes extending through -said casing.

8.'An exhaust silencer comprising an ex:

pansion chamber, a wire gauze in the inlet pipe thereof, a conductor extending from said expansion chamber to a receptacle formed of a flexible material, a wire gauze inlsaid conductor, 'an air tight casing surrounding said receptacle and means for varying the pressure within said casing.

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 8th day'of September1911.

ALFRED LLOYD-HOBBY.

In presence of' HORACE Orro LITTLE, r H. G. PRosT. 

